Noncompliant spacers that support the hinge bar of the roof flaps were discovered on 16 Cup cars during inspection last Thursday before the Coke Zero 400. Officials then found the same spacer configurations on 15 Nationwide cars.

Vice president of competition Robin Pemberton said a review of the roof flaps, which deploy during a spin to help keep a car from going airborne, determined that safety wasn't compromised by the modifications nor was there an impact on competition.

"Moving forward, we will work with the roof flap manufacturer and the race teams to evaluate and optimize the associated installation hardware, review the process in its totality and communicate in a timely manner to the garage area any revisions that we determine need to be made," Pemberton said in a release.

It was estimated that teams made their cars about 3 ounces lighter with the modified spacers, but some crew chiefs claimed there was no advantage on restrictor-plate tracks such as Daytona.

"There are no gains being made on superspeedways," Dave Rogers, crew chief for Kyle Busch, said at Daytona. "The advantage is 3 ounces of weight you saved up high in your roof." Rogers said it might be advantageous to have more weight in the roof at Daytona.

Pemberton said at Daytona that teams probably had been using the spacers in the past, and the infraction might have been missed because it wasn't on the inspectors' normal routine.

Keselowski had lobbied NASCAR to be lenient in its reaction. All teams replaced the spacers before drivers practiced at Daytona.

"The parts were fixed on all the cars, and nobody raced them, and we move on," the defending series champion said after qualifying last Friday. "Problem solved. I'd like to see our processes go that way. I think that's the way they were more traditionally done over the last 10 or 15 years, and I think that model served the sport fairly well."